Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020WR028235 |
Utilizing Environmental Tracers to Reduce Groundwater Flow and Transport Model Parameter Uncertainties | |
Nicholas E. Thiros; W. Payton Gardner; Kristopher L. Kuhlman | |
2021-07-07 | |
发表期刊 | Water Resources Research |
出版年 | 2021 |
英文摘要 | Non-uniqueness in groundwater model calibration is a primary source of uncertainty in groundwater flow and transport predictions. In this study, we investigate the ability of environmental tracer information to constrain groundwater model parameters. We utilize a pilot point calibration procedure conditioned to subsets of observed data including: liquid pressures, tritium (3H), chlorofluorocarbon-12 (CFC-12), and sulfur hexafluoride (SF6) concentrations; and groundwater apparent ages inferred from these environmental tracers, to quantify uncertainties in the heterogeneous permeability fields and infiltration rates of a steady-state 2-D synthetic aquifer and a transient 3-D model of a field site located near Riverton, Wyoming (USA). To identify the relative data worth of each observation data type, the post-calibration uncertainties of the optimal parameters for a given observation subset are compared to that from the full observation dataset. Our results suggest that the calibration-constrained permeability field uncertainties are largest when liquid pressures are used as the sole calibration dataset. We find significant reduction in permeability uncertainty and increased predictive accuracy when the environmental tracer concentrations, rather than apparent groundwater ages, are used as calibration targets in the synthetic model. Calibration of the Riverton field site model using environmental tracer concentrations directly produces infiltration rate estimates with the lowest uncertainties, however; permeability field uncertainties remain similar between the environmental tracer concentration and apparent groundwater age calibration scenarios. This work provides insight on the data worth of environmental tracer information to calibrate groundwater models and highlights potential benefits of directly assimilating environmental tracer concentrations into model parameter estimation procedures. This article is protected by copyright. All rights reserved. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/333766 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Nicholas E. Thiros,W. Payton Gardner,Kristopher L. Kuhlman. Utilizing Environmental Tracers to Reduce Groundwater Flow and Transport Model Parameter Uncertainties[J]. Water Resources Research,2021. |
APA | Nicholas E. Thiros,W. Payton Gardner,&Kristopher L. Kuhlman.(2021).Utilizing Environmental Tracers to Reduce Groundwater Flow and Transport Model Parameter Uncertainties.Water Resources Research. |
MLA | Nicholas E. Thiros,et al."Utilizing Environmental Tracers to Reduce Groundwater Flow and Transport Model Parameter Uncertainties".Water Resources Research (2021). |
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